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some metals appear dull?

Asked by 17th September 2013, 3:30 PM
Answered by Expert
Answer:
Metals when exposed to air for a long time develop a thin layer of oxide,carbonate or sulphide by the slow action of the various gases present in air.Due to oxidation, a new layer is formed giving the metals a dull appearance.
Answered by Expert 18th September 2013, 8:56 AM
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